Automatic safety device for elevators.



A No. 643,270. Pat ent ed F eb. l3, I900. a. A. NEWELL.

AUTOMATIC SAFETY DEVICE FOR ELEVATORS.

(Application filed July 24, 1899.)

(No Model.)

ATENT rric.

GEORGE A. NEVVELIJ, OF BUFFALO, NEW YORK, ASSIGNOR OF TIVO-THIRDS TO PHILIP GERST AND GEORGE A. STRIOKER, OF SAME PLACE.

AUTOMATIC SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 643,270, dated February 13, 1900..

Application filed July 24, 1899. Serial No. 724,903. (No model.)

T0 at whom it may concern.-

Be it known that I, GEORGE A. NEWELL, a citizen of the United States, residing at Buf falo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Automatic Safety Devices yond the edge of thefloor of an elevator-car,

especially in freight elevators, and being jammed or crushed between the car-floor and the floor of the building.

The object of my invention is to provide a simple and cheap device adapted to be attached to any well-known elevator system and to be automatically operated by the striking of the protruding portion against an attachment, thereby releasing a weight which moves the controller-rope sufficiently to stop or reverse the movement of the car, all of which will be fully and clearly hereinafter described and claimed, reference being had to the accompanying drawings, in which- Figure 1 represents a side elevation of an elevator-shaft equipped with my improved safety device. Fig. 2 is a vertical section on or about line a a, Fig. 1. Fig. 3 is a horizontal section on or about line b b, Fig. 1. Fig.

4 represents an enlarged detached view of the operating-trigger.

In referring to the drawings for the details of construction like numerals designate like parts.

I have represented in the accompanying drawings a preferred type of my improvement attached to an ordinary freight-elevator, in which 1 designates the rear wall of the elevator-shaft, 2 and 2 the side walls, 3 the car-slideways, 4 the car, and 5 the operating cable or rope, which is attached at one end to the car and extends to a source of power, all of which are of the usual and well-known construction.

The controller rope or cable 6 is of the ordinary construction and encircles the upper and lower pulleys or wheels 7, which in turn are in connection with the power attached to the operating cable or rope, so that the car can be started, moved in either direction, or stopped by the upward or downward movement of the controller-rope.

My improved attachment comprises a Weight 8, which is supported in a slideway 9, preferably secured to the rear wall 1 of the elevator-shaft, a rope or cable 10, which is preferably attached at its ends to the weight 8 and at its center to the controller rope or cable 6 to operatively connect the weightand controller rope or cable, a rope or cable extending across the upper portion of each opening in the shaft slightly below each floor and mounted on pulleys, and a main operating rope or cable 11, having connection with the rope or cable extending across the opening, and a trigger device at its upper end, which normally locks the weight in its raised. position.

The ropes or cables, one of which extends across the opening in the elevator-shaft on each floor of the building, are each preferably arranged as shown in Fig. 1 and consist of the lower substantially horizontal part 12, one end 13 of which extends over a pulley 14, attached to one of the side walls 2, then diagonally upward over a pulley 15, attached to one of the floors of the building, then diagonally downward over one roller of a double pulley 16, attached to the opposite side wall 2 into connection with the opposite end17, which extends over the remaining roller of the double pulley, the two ends being united and extending horizontally backward over a pulley 18, attached to the rear portion of the side wall 2 then horizontally to and over a pulley 19, attached to the rear wall 1, and into connection with the main operating rope or cable 11. The trigger device is preferably composed'of a rod 20, having an enlargement or collar 21, having a slot in its lower portion, in which is rotatably mounted a roller 22. The rod 20 is supported in and extends through a substantially horizontal opening in one of the walls of the slideway 9 and is normally held with its inner extreme projecting 10o sufficiently to extend into an opening in the side of the weight and maintain it in an elevated position by the spring 22. Its end is also slotted, and a roller 23 is journaled between the forks, with its periphery extending above the surface of the end, as shown in Fig. 4.

The upper end of the rope 11 bends over a pulley 24, arranged substantially horizontally opposite the rod 20 and into connection with said rod. The roller extends below the surface of the rod and travels upon the bottom of the opening in the wall of the slideway 9, and the roller 23 contacts with the upper surface of the opening in the weight, thus affording means for the easy movement of the rod in the opening.

The weight Sis preferably sufficiently heavy to move the controller-rope far enough when dropped to reverse the running direction of the car, and a second weight 25 is supported in a second slideway 26 and is normally maintained in an elevated position by a trigger device similar to the trigger employed in connection with the weight 8, which is connected to the weight 8 by a rope or cable 27, extend ing from the trigger device horizontally outward, bending around the pulley 28, then upward over the pulley 29, then horizontally to and over the pulley 30, and downward into connection with the weight 8.

The rope or cable 27 is normally in a loose or slack condition, (see Fig. 1,) and the object of the additional weight will be fully explained in the following description of the operation of the device.

The car having been started upward, any portion of a person or object protruding or extending outwardly beyond its floor will neeessarily strike against thelower portion 12 of the rope or cable extending across the opening and force it upward, thereby moving its ends inwardly and exerting a downward pressure upon the rope or cable 11 sufficient to draw the trigger device and release and allow the weight 8 to drop. The dropping of the weight 8 pulls one side of the controller rope or cable downward by gravity sufficiently to stop and reverse the movement of the car, which descends a short distance to prevent any probability of the person or object catching or wedging between the adjacent floors of the car and building and is stopped by the automatic dropping of the second weight 25, through the withdrawal of its trigger device by the tightening of the rope or cable 27 and its movement upon its supportingpulleys by the downward movement of the weight 8. The weight 25 is connected to the controllerrope on the side opposite the connection of the weight 8 and upon dropping exerts a downward pressure upon the side of the controller rope or cable and moves the same sufficiently to counteract the influence of the weight 8, thus stopping the car. The weight 25 is raised by means of the rope or cable 31,

which passes over the pulleys 82 and 33 and extends downward the length of the elevatorshaft, passing through an opening in the car, and the weight 8 is reelevated by the upward movement of the side of the controller-rope to which the cable or rope 10is connected necessary to start the power to again elevate the car.

From the construction the car cannot be elevated after the safety device has been operated until the heavier weight is returned to its normally-elevated position, as it will immediately draw the controller rope or eable down and stop the car upon the release of pressure should the operator fail to discover its downward position by the extra pressure upon the controller rope or cable as he pulls it to start the car, thus insuring the arrangement of the safety device in operative position upon the upward movement of the car.

I claim as my invention- 1. An automatic safety device for elevators, comprising a weight connected to the controller of the elevator and normally maintained in a raised position, and a device operated by an object protruding from the car edge adapted to drop the weight and automatically move the controller to stop the car, said weight being restored to its normallyraised position by the movement of the controller to again start the car.

2. An automatic safety device for elevators, comprising a weight connected to the controller rope or cable, a trigger d evice for maintaining said weight in a normally-raised position, a rope or cable connected to the trigger device and having portions arranged across the openings in the elevator-shaft adapted to be struck by an object protruding from the car edge to move the rope or cable and trigger device and drop the weight, said weight being restored to its normally-raised position by the movement of the controller-rope to again start the car.

3. In an automatic safety device for elevators, the combination with the elevator-shaft, the controller rope or cable of the elevator and the elevator-car, of a slideway device mounted in the shaft,a weight supported in the slideway and having operative connection with the controller rope or cable, a trigger mounted in a horizontal opening in the slideway and adapted to normally maintain the Weight in its elevated position, rollers journaled in the trigger, and a rope or cable attached to the trigger and having portions arranged on pulleys across the openings in the elevator-shaft, as set forth.

4. In an. automatic safety device for elevators, the combination with the elevator-shaft, the controller rope or cable of the elevator and the elevator-car, of a double slideway mounted in the shaft, two weights mounted in said slideway and normally held in a raised position, a supplementary rope or cable connected to one of said weights, and having a tained in a raised position and a device operated by an object protruding from the car edge adapted to drop the weight and automatically move the controller to stop the car, a second weight normally maintained in a raised position, a device connected to the firstmentioned Weight and operated by the dropping of said first-mentioned weight a certain distance to automatically release the second Weight and means for returning the weights to their normally-raised position, as set forth.

GEORGE A. NEWELL.

WVitnesses:

L. M. BILLINGS, G. A. NEUBAUER. 

